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SUMMARY:Probing Lorentz Invariance Violation with Air-Shower Maximum Distr
 ibutions
DTSTART;VALUE=DATE-TIME:20261027T162500Z
DTEND;VALUE=DATE-TIME:20261027T163000Z
DTSTAMP;VALUE=DATE-TIME:20261021T015452Z
UID:indico-contribution-6500@cern.ch
DESCRIPTION:Speakers: Nickolay Martynenko (Lomonosov MSU\, Faculty of Phys
 ics & Institute for Nuclear Research\, RAS)\nLorentz invariance violation 
 (LIV) can modify electromagnetic interactions at ultra-high energies and t
 hereby affect the development of extensive air showers (EASs). We study a 
 subluminal photon-sector LIV scenario in which Bethe–Heitler pair produc
 tion is suppressed. Using LIV-modified EAS simulations\, we model the resu
 lting changes in the depth of shower maximum\, $X_{\\max}$\, and reconstru
 cted energy. The predictions are folded with the published Pierre Auger Ob
 servatory fluorescence-detector response and compared with the measured $X
 _{\\max}$ distributions\, allowing the primary composition to vary. Within
  this simplified analysis\, we obtain the 95% confidence-level constraint 
 $M_{\\rm LIV}>1.5\\times10^{21}\\\,\\text{GeV}$\, where $M_{\\rm LIV}$ is 
 the characteristic LIV energy scale in the photon sector. This result demo
 nstrates the potential of hadron-induced EASs for probing photon-sector LI
 V.\n\nThis work was supported by the Russian Science Foundation\, grant 22
 -12-00253(P). The speaker acknowledges a PhD student fellowship from the T
 heoretical Physics and Mathematics Advancement Foundation “BASIS” unde
 r contract 24-2-10-39-1.\n\nhttps://indico.particle.mephi.ru/event/626/con
 tributions/6500/
LOCATION:Sevastopol hotel Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6500/
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